Effect analysis the geometry obtuse and acute arcs On the acoustic quality of lecture halls

Research Problem: 

From the past, acoustic quality in the architectural form of collective spaces has been considered by architects. So far, the curve fitting equation and the form of acute and obtuse arcs have not been studied acoustically in large-scale lecture space. Researchers have studied the sound quality of curved roof shapes according to the type of arch, materials, height and their history. By analyzing the equation of curve fitting and form in acute and obtuse arcs in acoustics, it is possible to understand the form and computational structure of the arc based on acoustic quality, Which is directly affected by volume, surface, height to the opening and the curve fitting equation. Impaired speech and language communication is a factor in not paying attention to the acoustic quality of the environment. However, indoor acoustic environments are not limited to professional performance spaces. In recent years, architectural acoustics have used music in non-professional spaces, such as spaces such as offices, libraries, multipurpose spaces, lecture halls, etc. When a speech signal is transmitted in a space, the speech transmission index, the bending time and the speech resolution of this frequency in the transmission path are affected by the architectural form and change and affect the sound quality of the environment.

Research Question: 

What is The effect of architectural parameters and curve fitting equation of acute and obtuse arcs on the components of acoustic quality? What is the relationship between architectural parameters and acoustic quality components?

 Data collection is based on library data and simulated arcs. Using the combined method (simulation, descriptive analysis) is placed in the category of applied articles. After drawing the samples by the algorithm method in Grasshopper software, then the fitting curve by the matrix method was calculated with SPSS 22 software. After that, acoustic simulation was performed using odeon software. Descriptive analysis of arches with violin diagram was performed by RStudio software. Acute and ambiguous arc correlation analysis between architectural and acoustic variables was performed by Spearman method with SPSS software. Spearman correlation coefficient was used to test the relationship between non-parametric acoustic and architectural variables.

 Improving the acoustic quality in the lecture space is one of the most important goals of the architectural design of this space.The roof of the building is one of the most important factors that play an effective role in acoustic quality.Curved ceilings, despite their use and superior thermal quality, are good examples for reviewing and improving the acoustic quality of the lecture space.The analyzes revealed that the acute arcs at the reverberation time (RT) and speech transmission index (STI) had a higher median and at the clarity (C80) had a lower median than the obtuse arc. Decreasing the size of the forms increases the value of the speech transmission index (STI) and decreases the reverberation time (RT) and the clarity (C80). In the present study, the acoustic quality among the two groups of acute and obtuse forms of Iranian arcs is widely used. is